Perkins New 1000 Series Workshop Manual page 86

3
Caution: Ensure that the valve seat cutter is not allowed to fall on to the seat as this can damage the blades.
3 Fit the reamer/cutter assembly into the valve guide. Carefully turn the handle in a clockwise direction (B4)
and gradually move the reamer into the valve guide until the valve guide is reamed to the finished size. A
lubricant is not necessary.
4 Continue to turn the handle in a clockwise direction to cut the valve seat. Remove only the minimum material
to ensure a good valve seat. Keep the seat as narrow as possible.
5 When the seat is cut, remove the reamer/cutter assembly. Remove any debris from the area of the valve
guide, valve seat and the port.
6 Fit the valve.
7 Check that the valve depth is within limits, refer to the Data and dimensions for "Inlet and exhaust valves"
on page 13.
Note: If a valve seat has become too damaged or too worn to correct, a valve seat insert can be fitted, see
Operation 3-23. If all or most of the original valve seat inserts need to be renewed, it may be cost effective to
overhaul or exchange the cylinder head.
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2
3
B
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This document has been printed from SPI². Not for Resale
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C040
New 1000 Series
Workshop Manual, TPD 1350E, Issue 4